with the older code, gif(4) interface goes to IFF_UP state with
physical (outer) address configuration, like:
# gif0 goes to IFF_UP mistakenly after this
ifconfig gif0 tunnel A B
the behavior is now corrected. if you have gif(4) configuration in
your system, and relied upon the behavior, you will need to add a
line to bring the interface up.
ifconfig gif0 tunnel A B
ifconfig gif0 up
itojun